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breaking: remove support for svelte.config.js - #16007

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Jun 26, 2026
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Rich-Harris merged 29 commits into
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remove-svelte-config

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@teemingc

@teemingc teemingc commented Jun 10, 2026 •

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This PR adjusts the docs and code to accept configuration only through the SvelteKit Vite plugin. Notably, it hides the config.kit prefix in favour of justconfig. since that kit property no longer exists when passing options to the SvelteKit Vite plugin

EDIT: blocked by sveltejs/language-tools#3055 so svelte check will fail until this is resolved


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🦋 Changeset detected

Latest commit: 9b234ec

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package
Name Type
@sveltejs/kit Major

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

@teemingc
teemingc marked this pull request as draft June 10, 2026 15:26
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@teemingc
teemingc marked this pull request as ready for review June 24, 2026 12:28
GrygrFlzr added a commit to GrygrFlzr/amedoko that referenced this pull request Jun 25, 2026
kit 3 will remove the option
sveltejs/kit#16007 for details
Comment thread documentation/docs/98-reference/50-configuration.md Outdated
Comment thread packages/kit/src/core/config/options.js Outdated
@Rich-Harris
Rich-Harris merged commit ab12cb6 into version-3 Jun 26, 2026
16 of 18 checks passed
@Rich-Harris
Rich-Harris deleted the remove-svelte-config branch June 26, 2026 01:35
Rich-Harris pushed a commit that referenced this pull request Jun 26, 2026
This PR was opened by the [Changesets
release](https://github.com/changesets/action) GitHub action. When
you're ready to do a release, you can merge this and the packages will
be published to npm automatically. If you're not ready to do a release
yet, that's fine, whenever you add more changesets to version-3, this PR
will be updated.

⚠️⚠️⚠️⚠️⚠️⚠️

`version-3` is currently in **pre mode** so this branch has prereleases
rather than normal releases. If you want to exit prereleases, run
`changeset pre exit` on `version-3`.

⚠️⚠️⚠️⚠️⚠️⚠️

# Releases
## @sveltejs/adapter-netlify@7.0.0-next.1

### Major Changes


- breaking: require `vite@^8.0.12`, the first Vite 8 release bundling
stable `rolldown` 1.0.0
([#16134](#16134))


### Patch Changes

- Updated dependencies
[[`a9629f1`](a9629f1),
[`53d37f9`](53d37f9),
[`dba6239`](dba6239),
[`ab12cb6`](ab12cb6),
[`f0eab52`](f0eab52),
[`cd884c1`](cd884c1),
[`9ed38a8`](9ed38a8),
[`53aa049`](53aa049),
[`984e57a`](984e57a),
[`51785be`](51785be),
[`4f6bcbb`](4f6bcbb),
[`78e7137`](78e7137)]:
  - @sveltejs/kit@3.0.0-next.5
## @sveltejs/adapter-node@6.0.0-next.1

### Major Changes


- breaking: require `vite@^8.0.12`, the first Vite 8 release bundling
stable `rolldown` 1.0.0
([#16134](#16134))


### Patch Changes

- Updated dependencies
[[`a9629f1`](a9629f1),
[`53d37f9`](53d37f9),
[`dba6239`](dba6239),
[`ab12cb6`](ab12cb6),
[`f0eab52`](f0eab52),
[`cd884c1`](cd884c1),
[`9ed38a8`](9ed38a8),
[`53aa049`](53aa049),
[`984e57a`](984e57a),
[`51785be`](51785be),
[`4f6bcbb`](4f6bcbb),
[`78e7137`](78e7137)]:
  - @sveltejs/kit@3.0.0-next.5
## @sveltejs/adapter-vercel@7.0.0-next.1

### Major Changes


- breaking: require `vite@^8.0.12`, the first Vite 8 release bundling
stable `rolldown` 1.0.0
([#16134](#16134))


### Patch Changes

- Updated dependencies
[[`a9629f1`](a9629f1),
[`53d37f9`](53d37f9),
[`dba6239`](dba6239),
[`ab12cb6`](ab12cb6),
[`f0eab52`](f0eab52),
[`cd884c1`](cd884c1),
[`9ed38a8`](9ed38a8),
[`53aa049`](53aa049),
[`984e57a`](984e57a),
[`51785be`](51785be),
[`4f6bcbb`](4f6bcbb),
[`78e7137`](78e7137)]:
  - @sveltejs/kit@3.0.0-next.5
## @sveltejs/enhanced-img@1.0.0-next.1

### Major Changes


- breaking: require `vite@^8.0.12`, the first Vite 8 release bundling
stable `rolldown` 1.0.0
([#16134](#16134))
## @sveltejs/kit@3.0.0-next.5

### Major Changes


- breaking: remove `base`, `assets`, and `resolveRoute` from
`$app/paths` ([#15507](#15507))


- breaking: require Svelte config options to be passed through the Vite
plugin ([#16007](#16007))


- breaking: `goto` now rejects when called with a URL that does not
resolve to a route within the app, matching the existing behaviour for
external URLs ([#16164](#16164))


- breaking: add 'error' result type to `preloadData`
([#12579](#12579))


- breaking: require `vite@^8.0.12`, the first Vite 8 release bundling
stable `rolldown` 1.0.0
([#16134](#16134))


### Minor Changes


- feat: expose `submitted` property of remote forms
([#14811](#14811))


### Patch Changes


- fix: clear issues and touched states on form reset
([#16163](#16163))


- fix: return 404 for form actions and remote functions whose name is an
`Object.prototype` member
([#16072](#16072))


- feat: send periodic `keep-alive` SSE comments from `query.live` to
prevent idle-timeout errors
([#16063](#16063))


- fix: render pages over sibling endpoints without GET or HEAD handlers
([#16125](#16125))


- fix: sort directory entries when building the route manifest so node
indices are deterministic across runtimes (e.g. Bun and Node)
([#16074](#16074))


- fix: include hoisted packages in Vite's `server.fs.allow` list
([#15998](#15998))
## @sveltejs/package@3.0.0-next.1

### Patch Changes


- fix: declare typescript as an optional peer dependency so
svelte-package works under strict node-linkers
([#16073](#16073))

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
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